Tire.



J. J. FIELDS. I

TIRE.

APPLICATION FILED JAN-6.1912.

1,079,755 Patented Nov. 25, 1913.

'VHZM 00o Q I 5 0044/6012 4 .5% 1 13 W. v 351 4136. x M4014 "NITELlDSTATES PATE JOHN J. FiELDS, or New YORK, N. Y.

TIRE. I

Specification of Letters Patent.

Patented Nov. 25,1913.

Application filed January 6, 1912. Serial No. 669,830.

tional action upon the .tire that would be likely to retard itsfree'revolution, and to providea tire that will stand any strain towhich it can be subjected.

My invention consists of the structure hereinafter described and'setforth in the claims.

In the accompanying drawing, Figure 1 is a perspective view of oneembodiment of my invention; Fig. 2 is a transverse section on the line2-2 of Fig. 1, and. Fig. 3 is a plan view of a slightly different formof tire from that shown in the other figures.

Similar characters represent like parts in allthe figures.

1 is a tire or traction portion of a wheel, and preferably of someelastic material such as india rubber, the central tread portion 2 ofwhich is thicker than the rest. Extendingaround said port-ion 2 are aseries of depressions 3, preferably round, and provided with outwardlyprojecting nibs 4, Which do not extend quite as far as the outer surfaceof said portion 2. These nibs A are also preferably round and tapering,and the portions of the depressions 3 surrounding'said nibs are formedinto wedge shaped recesses 5.

6 are wedge shaped depressions arranged on the parts of the tire next tothe portion 2, on either side of the depressions 3, and.

preferably in staggered relation to the depressions 8. The bases 7 ofsaid wedges are curved, are nearest to the central portion 2,

and their inner sides 7 tapering from base to edge, and preferablyconvex, and their opposite sides 8 are preferably parallel.

f there should be a tendency for thetire 1 to slip along the ground, theair surrounding the nibs 3 in the recesses 5 would be compressed,and'cause a resistance to the slipping action, and an air cushion willalso be formed between the nibs 4 and the ground to compensate for anytendency to suction of traction movements.

the-tire to the ground, and to'assist it in its If the tire 1 shouldhave a tendency to slide sidewise or skid, say, to the direction of thearrow Fig. 2, the

air.contained in the wedge shaped recesses 5 and ,6 between the tire andthe ground, would be caused to be converged by and compressed againstthe base of the wedge, thus forming a resistance to the skiddingmovement, and also forming an air cushion to overcome orcompensate forany tendency to skid. The air com-pressing action and re- 'sistance aremarked in the recesses 6 when the inclined surface of said recessesrests upon the ground.

In Fig. 3, I have shown the central depressions 9 as well as the otherdepressions 10 of oval form, the sides 11 of the wedge as well as itsbase 12 being curved.

M-y improved tire is practically non-slipping and non-skidding, assistsmaterially the traction action of the wheel, and will stand injuring itor impairing its efficiency.

What I claim as new and desire to secure by Letters Patent is:

1. A tire having its portions next to its central portion provided withlateral wedge shaped depressions sunk beneath the normal curved outercontour of the tire, and the bases of said depressions contractingtoward said central portion.

2. A tire having its portions next to its central portions provided withlateral wedge shaped. depressions sunk beneath the normal curved outercontour of the tire, and the bases of said depressions curved andcontracting toward said central portion.

3. A tire having its central portion provided with depressions, and theportions of the tire next to said central portion provided with lateralwedge shaped depressions sunk beneath the normal outer curved contour ofthe tire, and the bases of said wedge shaped depressions contractingtoward said central portion. v

4:. A tire having its central portion provided with depressions, and theportions of the tire next to said central portion provided with lateralwedge shaped depressions sunk beneath the normal outer curved contour ofthe tire, and the bases of said wedge shaped depressions curved andcontracting toward said central portion.

5. A tire having its central portion provided with depressions, and theportions of -,a great amount of wear and strain without the tire, thebases of said wedge shaped de- 5 pressions contracting toward saidcentral portionrand' said Wedge shaped depressions arranged in'staggeredrelationto the central depressions.

'6. A tire having its central portion pro- 10 Vid'ed withdepressions,and the portions of the tire next to said central portionprovided with lateral wedge shaped; depressions sunk beneath the normalouter curvedfcontour of the tireythe bases of said wedge shapeddcpressions curved and contracting toward 5 said central portion,'andsaid wedge shaped depressions arranged in staggered relation to thecentral depressions.

In testimony whereof, I have signed my name to this specification, inthe presence of 20 two subscribing witnesses.

JOHN J. FIELDS. Witnesses: I I

WM. S; Yonne G. A. KAVEN.

